Chromate fate and effect in bioelectrochemical systems for remediation of chlorinated solvents

A continuous-flow bioelectrochemical reactor was developed in a previous study to address the bioremediation of groundwater contaminated by trichloroethene (TCE). The present report investigated the applicability of the same system in the presence of Cr(VI) and its possible inhibitory effect on dehalorespiring bacterial populations. Preliminary batch tests were performed at the optimal cathodic reducing potential for the reductive dechlorination (RD) of TCE (-0.65 V vs. the standard hydrogen electrode) with two different dechlorinating microorganism consortia. The results demonstrated that Cr(VI) removal efficacy was increased by microorganisms that had been previously acclimatised to Cr(VI). Specifically, Cr(VI) was completely reduced only in the presence of acclimated microorganisms. The presence of chromate negatively affected RD performance, by either (i) limiting the TCE transformation to cis-dichloroethene at lower concentrations, or (ii) completely inhibiting RD at higher concentrations. In contrast, after the acclimation period, RD was extended down to vinyl chloride, which is the main TCE daughter product. Finally, the continuous flow reactor was fed by synthetic groundwater contaminated with TCE (50 μM) and Cr(VI) (45 μM), and the experimental results showed that Cr(VI) was completely reduced under RD conditions. Moreover, TCE removal was complete, with vinyl chloride and ethene as the main intermediates, thus indicating that chromate inhibition was decreased by Cr(VI) removal

The 23rd Annual International Conference on Soils, Sediments and Water

Conference at a Glance Monday, October 15, 2007 (workshop #1-2: 9:00am – 5:00pm, workshop #3: 10am – 5:00pm, workshop #3, 10:00am – 5:00pm, workshops #4, 5, & 6, 1:00pm – 5:00pm, workshop #7 & 8, 2-5pm) 1) Compliant Analysis of Water, Wastes and Related Solid Environmental Samples Using Inductively Coupled Plasma Atomic Emission and Mass Spectrometry 2) In-Situ Chemical Oxidation Workshop 3) Theory and Use of Field Portable X-ray Fluorescence for Soil Analysis 4) The 2007 MCP Audit – A Case Study Approach 5) “Lies, Damned Lies, and Statistics”: Avoiding Pitfalls in Environmental Sampling 6) Evaluating Monitored Natural Attenuation of MTBE and TBA 7) Environmental Forensic Techniques for Classic and Emerging Contaminants 8) Environmental Fate of Hydrocarbons in Soils and Groundwater Tuesday, October 17, 2007 Morning 8:30am – 9:00am Conference Welcome and Overview 9:00am – Noon, Sessions are concurrent Session 1: Ethics in Environmental Practice: Responsibilities, Benefits & Case Examples Session 2a: Pesticides Session 2b: Vapor Intrusion Session 3a: Brownfields Session 3b: Fisherville Mill - Assessment and Cleanup of a Brownfields Site on the Blackstone River Session 4a: Environmental Fate Session 4b: Sediments Afternoon 1:30 to 5:30pm, Sessions are concurrent Session 1: Phytoremediation Session 2: Biotechnology Session 3: Tungsten Session 4: Combining Chemical and Biological Technologies for Soil and Groundwater Remediation Session 5: Environmental Forensics Poster Sessions 4:00 – 6:00pm Arsenic Environmental Fate Environmental Forensics Pesticides Phytoremediation Remediation Sediments Tungsten Vapor Instrusion Social 4:30 – 6:00pm, exhibit area, 1st floor Workshops (Evening, 7:00 – 10:00pm) 9) In-Situ Thermal Remediation 10) Applied Chemical Fingerprinting in Environmental Forensics 11) Utilization of Stable Isotopes in Environmental and Forensic Geochemistry Studies 12) Professional Ethics, Professional Conduct, and Environmental Professionals Wednesday, October 17, 2007 Morning 8:30am – Noon, Sessions are concurrent Session 1: Gasoline Oxygenates I Session 2: Remediation I Session 3: Regulatory Session 4: Coated and Uncoated Microbubble Ozone Remediation Projects Afternoon 1:30 – 5:30pm, Sessions are concurrent Session 1: Gasoline Oxygenates II Session 2: Perchlorate/MECs Session 3: Analysis Session 4: Chemical Oxidation Poster Sessions 4:00 – 6:00pm Acid Mine Drainage Analysis Bioremediation Brownfields Chemical Oxidation Emerging Issues with Energy in the Environment Heavy Metals MECs Miscellaneous MTBE Radionuclides Site Assessment Social 4:30 – 6:00pm, exhibit area, 1st floor Workshops (Evening, 7:00 – 10:00pm) 13) Critical Exposure Pathways 14) Characterizing PAH Bioavailability in Sediments for Remedial Decision-Making 15) Theory and Application of Molecular Biological Tools (“MBTs”) and Biogeochemistry to Bioremediation Process Monitoring and Monitored Natural Attenuation Programs 16) Geochemical Evaluations of Metals in Environmental Media: How to Distinguish Naturally Elevated Metals Concentrations from Site-Related Contamination Thursday, October 18, 2007 Morning 8:30am – Noon Sessions are concurrent Session 1: Bioremediation Session 2: Remediation II Session 3: Modeling Session 4: Risk Assessment Afternoon 1:30pm – 5:00pm Sessions are concurrent Session 1: Heavy Metals Session 2: Innovative Technologies Session 3: Site Assessmen

FLOWPATH 2019 – NATIONAL MEETING ON HYDROGEOLOGY

FLOWPATH 2019, the 4th National Meeting on Hydrogeology, was held in Milan from 12th to 14th June 2019. According to the aim of the previous Editions of FLOWPATH, held in Bologna (2012), Viterbo (2014) and Cagliari (2017), the conference is an opportunity for Italian hydrogeologists to exchange ideas and knowledge on different groundwater issues. The objectives of the conference are: – To promote dialogue and exchange of scientific knowledge among young hydrogeologists; – To deepen the theoretical and practical aspects of our understanding on groundwater; – To update all the stakeholders, researchers and professionals on recent challenges in the hydrogeological sciences; – To encourage researchers, professionals and administrators to contribute to the improvement of water resources management